And why we don't have issues with big ultimate Guards-Penals blob for example? Becasue SU lacks of FRP which makes blobbing easier, faster, less punishing. Give SU FRP and you gonna notice insane blobs.
the m1919a6 are a lot better than the guard's dp-28. the garand is also far better than the guard's mosin. that dps give dual m1919a6 rifleman the ability to walk over most opposition.
You don't even have to look at the soviet. compare the effectiveness of dual m1919a6 to dual bar.
The penal have rather "normal" dodging bonus compared to the most extreme example.
blob is the easiest and simplest strat to use. it become a problem when the blob have high dps and high dodging bonus.